[Evaluation of the agronomic efficiency of some phosphorocomposts with a Venezuelan phosphorite and Eichhornia crassipes (Mart, 1985)]
1995
Moshin, M. | Marcano, A.
Five phosphocomposts were prepared using water hyacinth, cowdung sludge, bean rhizosphere soil, fertilizers (urea and KCl) and a phosphate rock (PR) of Navay by incubation for 120 days with the following objetives: to study the disolution of the PR during the descomposition of water hyacinth and its mixtures; to evaluate the availability of some nutrients and to determine the relative agricultural potential (RAP) of the manures elaborate. The availability of P, K and N (ammonium) was verified every fifteen days during the composting period. The RAP for the phosphocomposts was evaluated in a green house experiment sowing sorghum as a testing crop in a Tonoro Oxisol from the state of Monagas. In the same experiment triple superphosphate (TSP) was also used to compare the results. The data obtained showed an increase in the availability of phosphorus in the majority of the composts with the exception of the one that received fertilizers (K y N). This manure produced a sharp rise in the content of available P in the first fifteen days followed by a gradual fall up to the next sixty days when it reverted to show a slight rise in soluble P up to the end of the incubation period. The total content of N, P y K in the phosphocomposts varied between 0,85 to 1,45 percentage; 0,25 to 0,36 percentage and 1,33 to 7,96 percentage respectively. In the green house experiment the phosphocomposts increased significantly the yield of the plant dry weights; and some of these dry matters were statistically similar to those found with the TSP.
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